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Interaction between the light quality and flowering time pathways in Arabidopsis
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Adams, Sally, Allen, Trudie and Whitelam, Garry C. (2009) Interaction between the light quality and flowering time pathways in Arabidopsis. Plant Journal, Vol.60 (No.2). pp. 257-267. doi:10.1111/j.1365-313X.2009.03962.x
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Official URL: http://dx.doi.org/10.1111/j.1365-313X.2009.03962.x
Abstract
Flowering in Arabidopsis is accelerated by a reduced ratio of red light to far-red light (R/FR), which indicates the proximity of competitive vegetation. By exploiting the natural genetic variation in flowering time responses to low R/FR, we obtained further insight into the complex pathways that fine-tune the transition to flowering in Arabidopsis. The Bla-6 ecotype does not flower significantly earlier in response to low R/FR, but is still able to display other features of shade avoidance, suggesting branching of low R/FR signalling. Here we show that the muted flowering response of Bla-6 is due to high levels of the floral repressor FLOWERING LOCUS C (FLC), conferred by a combination of functional FLC and FRIGIDA (FRI) alleles with a 'weak' FY allele. The Bla-6 FY allele encodes a protein with a corrupted WW binding domain, and we provide evidence that this locus plays a key role in the natural variation in light quality-induced flowering in Arabidopsis. In Bla-6, FLC blocks promotion to flowering by reduced R/FR by inhibiting expression of the floral integrator FLOWERING LOCUS T (FT) in a dose-dependent manner. Reduction of FLC removes this obstruction, and Bla6 plants then exhibit strong induction of FT and flower early in response to a low R/FR signal. This paper illustrates the intricate interaction of environmental signals and genetic factors to regulate flowering in Arabidopsis.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | S Agriculture > SB Plant culture | ||||
| Divisions: | Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010) | ||||
| Journal or Publication Title: | Plant Journal | ||||
| Publisher: | Blackwell | ||||
| ISSN: | 0960-7412 | ||||
| Official Date: | October 2009 | ||||
| Dates: |
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| Volume: | Vol.60 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 257-267 | ||||
| DOI: | 10.1111/j.1365-313X.2009.03962.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Funder: | Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC) | ||||
| Grant number: | BBD0004831 (BBSRC), P12848 |
Data sourced from Thomson Reuters' Web of Knowledge
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